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Investment Securities Available for Sale - Schedule of Investment Securities Available for Sale in Unrealized Loss Position (Details) - USD ($) $ in Thousands | Jun. 30, 2018 | Dec. 31, 2017
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Debt Securities, Available-for-sale [Line Items] |  |
Carrying Value Less Than 12 Months | $ 794,830 | $ 511,313
Gross Unrealized Losses Less Than 12 Months | (26,721) | (1,807)
Carrying Value Greater Than 12 Months | 305,760 | 343,156
Gross Unrealized Losses Greater Than 12 Months | (17,926) | (13,408)
Carrying Value | 1,100,590 | 854,469
Gross Unrealized Losses | (44,647) | (15,215)
Agency RMBS |  |
Debt Securities, Available-for-sale [Line Items] |  |
Carrying Value Less Than 12 Months | 794,830 | 511,313
Gross Unrealized Losses Less Than 12 Months | (26,721) | (1,807)
Carrying Value Greater Than 12 Months | 305,579 | 342,963
Gross Unrealized Losses Greater Than 12 Months | (17,916) | (13,390)
Carrying Value | 1,100,409 | 854,276
Gross Unrealized Losses | (44,637) | (15,197)
Non-Agency RMBS |  |
Debt Securities, Available-for-sale [Line Items] |  |
Carrying Value Less Than 12 Months | 0 | 0
Gross Unrealized Losses Less Than 12 Months | 0 | 0
Carrying Value Greater Than 12 Months | 181 | 193
Gross Unrealized Losses Greater Than 12 Months | (10) | (18)
Carrying Value | 181 | 193
Gross Unrealized Losses | $ (10) | $ (18)

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- Definition Amount of investment in debt security measured at fair value with change in fair value recognized in other comprehensive income (available-for-sale), in continuous unrealized loss position for more than 12 months. + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 320 -SubTopic 10 -Section 50 -Paragraph 7 -URI http://asc.fasb.org/extlink&oid=82897076&loc=d3e27337-111563 + Details
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- Definition Amount of accumulated unrealized loss on investment in debt security measured at fair value with change in fair value recognized in other comprehensive income (available-for-sale), in continuous unrealized loss position for 12 months or longer. + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 320 -SubTopic 10 -Section 50 -Paragraph 7 -URI http://asc.fasb.org/extlink&oid=82897076&loc=d3e27337-111563 + Details
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- Definition Amount of investment in debt security measured at fair value with change in fair value recognized in other comprehensive income (available-for-sale), in continuous unrealized loss position for less than 12 months. + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 320 -SubTopic 10 -Section 50 -Paragraph 7 -URI http://asc.fasb.org/extlink&oid=82897076&loc=d3e27337-111563 + Details
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